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5e5633cf8a
If the linker requested to preserve a linkonce function, we should honor this even if we drop all uses. We explicitely avoid turning them into weak_odr (unlike the first version of this patch in r267644), because the codegen can be different on Darwin: because of `llvm::canBeOmittedFromSymbolTable()` we may emit the symbol as weak_def_can_be_hidden instead of weak_definition. From: Mehdi Amini <mehdi.amini@apple.com> llvm-svn: 268607